With the (31) (develop) of industry, air pollution is getting more and more serious. In Beijing, many people (32) (suffering) from different kinds of (33) ( ill ) because of air pollution.
Air pollution is caused (34) the following reasons: about half of the problem is caused by vehicles（车辆）. There are more and more cars, buses on the roads, and they give off (35) (poison) gases. 25% of air pollution is caused by factories. Another (36) (fact) is the smokers. Smoking not only does harm to their health but also to others’. (37) these, about 10% of air pollution is caused by other reasons.
We should take some measures to fight (38) pollution. New fuel can be used to take the place of gas. We can plant more trees. If everybody realizes the importance of (39) (environment) protection and does something to stop pollution, the problem will (40) (solve).31. development 32. suffer 33. illnesses 34. by 35. poisonous
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(答案→)31. development 32. suffer 33. illnesses 34. by 35. poisonous
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